61516520775 has 36 divisors (see below), whose sum is σ = 110759875200. Its totient is φ = 32637014400.

The previous prime is 61516520759. The next prime is 61516520789. The reversal of 61516520775 is 57702561516.

61516520775 is a `hidden beast` number, since 6 + 1 + 51 + 6 + 520 + 7 + 75 = 666.

It is not a de Polignac number, because 61516520775 - 2⁴ = 61516520759 is a prime.

It is a super-2 number, since 2×61516520775² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 61516520775.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 672750 + ... + 758699.

It is an arithmetic number, because the mean of its divisors is an integer number (3076663200).

Almost surely, 2^61516520775 is an apocalyptic number.

61516520775 is a deficient number, since it is larger than the sum of its proper divisors (49243354425).

61516520775 is a wasteful number, since it uses less digits than its factorization.

61516520775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1431656 (or 1431648 counting only the distinct ones).

The product of its (nonzero) digits is 441000, while the sum is 45.

The spelling of 61516520775 in words is "sixty-one billion, five hundred sixteen million, five hundred twenty thousand, seven hundred seventy-five".